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Abstract:

We examine an interacting dark matter variable vacuum energy model for a spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance of cosmological singularities such as big rip, big brake, big freeze, and big separation along with abrupt events (infinite γ- singularity and new w-singularity) at late times. We introduce a phenomenological interaction which has a nonlinear dependence on the total energy density of the dark sector and its derivative, solve exactly the source equation for the model and find the energy density as a function of the scale factor as well as the time dependence of the approximate scale factor in the neighborhood of the singularities. We describe the main characteristics of these singularities by exploring the type of interaction that makes them possible along with behavior of dark components near them. We apply the geometric Tipler and Królak method for determining the fate of timelike geodesic curves around the singularities. We also explore the strength of them by analyzing the leading term in some geometric invariants such as the square Riemann scalar and the Ricci scalar. © 2015 American Physical Society.

Registro:

Documento: Artículo
Título:Interacting realization of cosmological singularities with variable vacuum energy
Autor:Chimento, L.P.; Richarte, M.G.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, Pabellón I, Buenos Aires, 1428, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, Buenos Aires, 1428, Argentina
Año:2015
Volumen:92
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevD.92.043511
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v92_n4_p_Chimento

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Citas:

---------- APA ----------
Chimento, L.P. & Richarte, M.G. (2015) . Interacting realization of cosmological singularities with variable vacuum energy. Physical Review D - Particles, Fields, Gravitation and Cosmology, 92(4).
http://dx.doi.org/10.1103/PhysRevD.92.043511
---------- CHICAGO ----------
Chimento, L.P., Richarte, M.G. "Interacting realization of cosmological singularities with variable vacuum energy" . Physical Review D - Particles, Fields, Gravitation and Cosmology 92, no. 4 (2015).
http://dx.doi.org/10.1103/PhysRevD.92.043511
---------- MLA ----------
Chimento, L.P., Richarte, M.G. "Interacting realization of cosmological singularities with variable vacuum energy" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 92, no. 4, 2015.
http://dx.doi.org/10.1103/PhysRevD.92.043511
---------- VANCOUVER ----------
Chimento, L.P., Richarte, M.G. Interacting realization of cosmological singularities with variable vacuum energy. Phys Rev D Part Fields Gravit Cosmol. 2015;92(4).
http://dx.doi.org/10.1103/PhysRevD.92.043511